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<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="xmlsec-notes-keys-mngr-verify-decrypt"></a>Using keys manager for verification/decryption.</h2></div></div></div>
<p>If more than one key could be used for signature or encryption,
	then using <em class="structfield"><code>signKey</code></em> member of 
	<a class="link" href="xmlsec-xmldsig.html#xmlSecDSigCtx" title="struct xmlSecDSigCtx">xmlSecDSigCtx</a> structure or 
	<em class="structfield"><code>encKey</code></em> member of 
	<a class="link" href="xmlsec-xmlenc.html#xmlSecEncCtx" title="struct xmlSecEncCtx">xmlSecEncCtx</a> structure 
	is not possible. Instead, the application should load known keys in 
	the keys manager and use &lt;dsig:KeyName/&gt; element to specify 
	the key name.
	</p>
<p>
	     </p>
<div class="example">
<a name="id-1.2.10.5.3.1"></a><p class="title"><b>Example 18. Initializing keys manager and loading DES keys from binary files.</b></p>
<div class="example-contents">
<pre class="programlisting">
/**
 * load_des_keys:
 * @files:		the list of filenames.
 * @files_size:		the number of filenames in #files.
 *
 * Creates default keys manager and load DES keys from #files in it.
 * The caller is responsible for destroing returned keys manager using
 * @xmlSecKeysMngrDestroy.
 *
 * Returns the pointer to newly created keys manager or NULL if an error
 * occurs.
 */
xmlSecKeysMngrPtr 
load_des_keys(char** files, int files_size) {
    xmlSecKeysMngrPtr mngr;
    xmlSecKeyPtr key;
    int i;
    
    assert(files);
    assert(files_size &gt; 0);
    
    /* create and initialize keys manager, we use a default list based
     * keys manager, implement your own xmlSecKeysStore klass if you need
     * something more sophisticated 
     */
    mngr = xmlSecKeysMngrCreate();
    if(mngr == NULL) {
	fprintf(stderr, "Error: failed to create keys manager.\n");
	return(NULL);
    }
    if(xmlSecCryptoAppDefaultKeysMngrInit(mngr) &lt; 0) {
	fprintf(stderr, "Error: failed to initialize keys manager.\n");
	xmlSecKeysMngrDestroy(mngr);
	return(NULL);
    }    
    
    for(i = 0; i &lt; files_size; ++i) {
	assert(files[i]);

	/* load DES key */
	key = xmlSecKeyReadBinaryFile(xmlSecKeyDataDesId, files[i]);
	if(key == NULL) {
    	    fprintf(stderr,"Error: failed to load des key from binary file \"%s\"\n", files[i]);
	    xmlSecKeysMngrDestroy(mngr);
	    return(NULL);
	}

	/* set key name to the file name, this is just an example! */
	if(xmlSecKeySetName(key, BAD_CAST files[i]) &lt; 0) {
    	    fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", files[i]);
	    xmlSecKeyDestroy(key);
	    xmlSecKeysMngrDestroy(mngr);
	    return(NULL);
	}
	
	/* add key to keys manager, from now on keys manager is responsible 
	 * for destroying key 
	 */
	if(xmlSecCryptoAppDefaultKeysMngrAdoptKey(mngr, key) &lt; 0) {
    	    fprintf(stderr,"Error: failed to add key from \"%s\" to keys manager\n", files[i]);
	    xmlSecKeyDestroy(key);
	    xmlSecKeysMngrDestroy(mngr);
	    return(NULL);
	}
    }

    return(mngr);
}
		</pre>
<p><a class="link" href="xmlsec-decrypt-with-keys-mngr.html#xmlsec-example-decrypt2" title="decrypt2.c">Full program listing</a></p>
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